"There is a lot that is missing or inaccurate in this report.  One:  The researcher in the video describes the material as a "polymer", not a metal.  Two:  If the material is, in fact, nickel, then nickel is not in fact the lightest metal ever.  It could only be the "lightest metal ever" if it were, in fact, a new, previously undiscovered metal, which it is not.  Three:  The researcher in the video describes the lattice as a new material:  it is not.  The lattice is a structure, not a material per se.  What needs to be done here is to explain the mass of the material (if it is in fact a new material) per volume, and compare that mass to other, comparable materials.  Only then will we know which is "lightest".  It would appear that this is promotional but not technically accurate - something that should be made clear to the lay public by our intrepid reporter.  Having said the above, I don't blame Rain Noe for whatever may be lacking in the report- I have no idea how he came by the information or from whom.  Mr. Noe continues to be an informative and entertaining writer and I use this website often as an essential resource, so by all means keep up the good work."